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401b64c4e8
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62656 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
41 lines
1.3 KiB
Ruby
41 lines
1.3 KiB
Ruby
require_relative '../../spec_helper'
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require_relative 'fixtures/classes'
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describe "Math.log2" do
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it "returns a float" do
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Math.log2(5.79).should be_close(2.53356334821451, TOLERANCE)
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end
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it "returns the natural logarithm of the argument" do
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Math.log2(1.1).should be_close(0.137503523749935, TOLERANCE)
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Math.log2(3.14).should be_close(1.6507645591169, TOLERANCE)
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Math.log2((2**101+45677544234809571)).should be_close(101.00000000000003, TOLERANCE)
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Math.log2((2**10001+45677544234809571)).should == 10001.0
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Math.log2((2**301+45677544234809571)).should == 301.0
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end
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it "raises an Errno::EDOM if the argument is less than 0" do
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lambda { Math.log2(-1e-15) }.should raise_error( Math::DomainError)
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end
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it "raises a TypeError if the argument cannot be coerced with Float()" do
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lambda { Math.log2("test") }.should raise_error(TypeError)
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end
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it "raises a TypeError if passed a numerical argument as a string" do
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lambda { Math.log2("1.0") }.should raise_error(TypeError)
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end
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it "returns NaN given NaN" do
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Math.log2(nan_value).nan?.should be_true
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end
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it "raises a TypeError if the argument is nil" do
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lambda { Math.log2(nil) }.should raise_error(TypeError)
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end
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it "accepts any argument that can be coerced with Float()" do
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Math.log2(MathSpecs::Float.new).should be_close(0.0, TOLERANCE)
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end
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end
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